Was in the boozer the other night and my mate Dan was spouting off about how in back to the future 3 when Marty goes back to the wild west and his car gets hit by an Indian's arrow. Rather than set the car on the train tracks, crash the train and risk almost certain death - they should just have used the Delorean that Doc Brown had used to go back in time (and hidden in a cave)

Can anyone see a problem with this?

Strange conversation I know!, but as he is a scouser anything is better than talking football at the momet!

It's been sooo long since I watched Back to the Future but wasn't that Delorean broken or something and didn't Marty have to get it fixed before using it?

End of Part 2: Doc gets sent back to 1885 in Dollorean.
Beginning of Part 3: Marty( in 1955) goes back to young Doc. But what car does he use to go back in time with? The dolloorean from part 1 is needed for marty(in part 1) to go back to 1985.
HELP

i think it was a hillman imp convertible

Thanks sted... so in conclusion kenners, the car in the cave is the one marty went back to 1885 in. There is no other Delorean that they could use.

The one in the cave that went back to 1885.

In 1885 the Doc puts the Delorean in cave for Marty to use in 1955 to get back to 1985. Instead of returning to 1985, Marty goes back to 1885 to rescue the Doc, therefore once Marty arrives at 1885 there are two Deloreans, the one he's in & the one in the cave (it's still waiting for Marty to find it in 1955).

However, Marty can't use the Delorean in the cave to leave 1885 because if he did that then it wouldn't be there for him to use in 1955 to go back to 1885...

oops you're right... there are 2 deloreans in 1885. sorry... my mistake.

EDIT: FWIW I found this graphic showing all the timelines... bloody complicated!!!

What Marty could of done (once he went back to 1885) was just drain the petrol tank from the Delorean in the cave, put it in the Delorean he arrived in so he could then get back to 1985 (it wouldn't of been any trouble to get petrol for the Delorean (in the cave) when he's finds it in 1955)...

According to an FAQ that I found with answers from the 2 writers of the trilogy... this is how they justify the lack of fuel.

Q: In I885, when Marry tells Doc they're out of gas; why don't they just go to the Delgado Mine, dig up the DeLorean where Doc hid it and get the gas out of it?

A: There are two logical answers to this one... 1) The car mechanic's answer: As anyone who has stored an automobile for a long period of time can tell you, you always drain all of the fluids out of the car before putting it into storage. Doc most certainly would have drained the gas out of the DeLorean if he was going to leave it hidden for 70 years. At the 1955 drive-in, Doc specifically says "I put gas in the tank" indicating that the DMC must have had an empty tank when they found it in the mine. 2) The time travel theory answer: Even if Doc had not drained the tank, he still would not have gone back into the mine for fear of creating a time paradox by accidentally damaging the DeLorean, the mine, or who knows what. After all, since Marty is now back in 1885, Doc's plan obviously worked, and worked perfectly. But what if Doc were to go back into the mine and accidentally cause a cave-in that causes even more damage to the DeLorean? What happens to the future of that DeLorean, when it's unearthed in 1955? And what might that do to Marty and the undamaged future DeLorean now in 1885? As an analogy, imagine a time traveler going back in time, finding himself as a child, and cutting off that child's hand with a meat cleaver. What happens to the adult time-traveler's hand? That would definitely risk a time paradox, and we know that Doc would never go out of his way to risk such a thing for fear of (in the worst case scenario) unraveling the fabric of the space-time continuum and destroying the entire universe.

Okay, but in part 2, old biff takes the dolorean back in time, then came back. But he has changed the future how can he return to 2015 future of marty and doc's.

Not quite sure what you mean but the explanation of timeline 4 above might cover it... here's what the writers say...

Q: What happened to old Biff when he staggered out of the DeLorean in 2015?

A: Our intention regarding old Biff was that upon his return to 2015, he would be erased from existence because he had changed his entire destiny by giving his younger self the Sports Almanac. (Probably, Lorraine shot him sometime around 1996!). After old Biff clutches his chest and staggers (the same symptoms that Marty exhibited in Back to the Future when he was beginning to be "erased"), we actually filmed him falling onto the street and vanishing, and we previewed the movie this way (see The Secrets of the Back to the Future™ Trilogy). However, the vast majority of the audience did not understand it, so we decided to cut it out, leaving the answer ambiguous, and subject to various interpretations -- besides the above explanation, you can believe that Old Biff had a heart attack from the shock of time travel of from flying the car, or from something that happened to him in 1955.

Suppose that theory works, I still think they would have risked it though rather than what they actually risked to get marty back to the future. If Doc had removed the petrol, he would have stored it somewhere

Thanks Dixie.